Title (en)

IMPROVEMENTS IN OR RELATING TO CUTTING STRUCTURES FOR ROTARY DRILL BITS

Publication

EP 0242999 A3 19881005 (EN)

Application

EP 87302492 A 19870323

Priority

GB 8609352 A 19860417

Abstract (en)

[origin: EP0242999A2] In a method of forming a cutting structure 14, for a rotary drill bit, of the kind comprising a preform cutting element 18 having a front cutting face formed of superhard material and a rear face bonded to a carrier 19 of less hard material, the cutting element is bonded to the carrier by means of an alloy containing phosphorus in such proportions that the liquidus temperature of the alloy is below 1050 DEG C. The base material of the alloy may be nickel, cobalt, copper or manganese, and the alloy preferably contains from 9% to 13% by weight of phosphorus.

IPC 1-7

B23K 35/30; E21B 10/56

IPC 8 full level

B23K 35/30 (2006.01); E21B 10/56 (2006.01); E21B 10/567 (2006.01); E21B 10/573 (2006.01)

CPC (source: EP US)

B23K 35/30 (2013.01 - EP); E21B 10/5735 (2013.01 - EP US)

Citation (search report)

• [X] FR 902885 A 19450914 - FR KAMMERER AG
• [A] FR 1242813 A 19601007 - ELECTRO HYDRAULICS LTD
• [A] US 4293089 A 19811006 - MCCORMICK JAMES T, et al
• [A] US 2864693 A 19581216 - CAPE ARTHUR T, et al
• [A] US 1651709 A 19271206 - JONES JESSE L
• [A] DE 668310 C 19381130 - PATENT TREUHAND GES FUER ELEKTRISCHE GLUEHLAMPEN MBH
• [AD] US 4527998 A 19850709 - KNEMEYER FRIEDEL S [US]
• [XP] EP 0185537 A2 19860625 - NL PETROLEUM PROD [GB]

Designated contracting state (EPC)

BE CH DE FR LI NL SE

DOCDB simple family (publication)

EP 0242999 A2 19871028; EP 0242999 A3 19881005; GB 2189176 A 19871021; GB 2189176 B 19900124; GB 8609352 D0 19860521

DOCDB simple family (application)

EP 87302492 A 19870323; GB 8609352 A 19860417